Method and apparatus for subsoil drilling

Details Method and apparatus for subsoil drilling Method and apparatus for subsoil drilling

1991-03-15

1992-03-17

Dang, Hoang C.

Boring or penetrating the earth

Processes

Boring curved or redirected bores

175 67, 175 73, 175320, 175324, 175424, E21B 706, E21B 718

Patent

active

050960032

ABSTRACT:
A method and apparatus for creating an underground bore hole employing a steerable boring head at the end of a remotely driven drill string. The boring head, preformed at an angle to the longitudinal axis of the trailing pipe string to bore along a curvilinear path is straightened by increasing the pressure of the fluid within the drill string above a predetermined range to enable drilling along a linear path. Subsequent reduction of the fluid pressure to normal drilling pressure returns the boring head to its former state along a resumption of a curvilinear drill path.

REFERENCES:
patent: 2345766 (1944-04-01), Miller
patent: 2643859 (1953-06-01), Brown
patent: 3199615 (1965-08-01), Storm
patent: 3457999 (1969-07-01), Massey
patent: 4286676 (1981-09-01), Nguyen et al.
patent: 4597454 (1986-07-01), Schoeffler
patent: 4790394 (1988-12-01), Dickinson et al.
patent: 4899835 (1990-02-01), Cherrington
patent: 4957173 (1990-09-01), Kinnan

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